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1, 2, 4, 6, 10, 17, 30, 53, 94, 164, 289, 510, 898, 1582, 2788, 4913, 8659, 15260, 26892, 47393, 83521, 147193, 259404, 457157, 805666, 1419857, 2502272, 4409854, 7771663, 13696316, 24137569, 42538612
(list; graph; refs; listen; history; internal format)
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